System Message

HPK1 Monoclonal Antibody (2A1)

Performance guaranteed

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the performance of our antibodies with the InvitrogenTM
antibody performance guarantee. If an InvitrogenTM antibody
doesn't perform in your experiment as described on our website
or datasheet, we'll replace the product at no cost to you, or
if you prefer, we'll provide you with a credit for a future
purchase.*
Learn more.

* Suggested working dilutions are given as a guide only. It is recommended that the user titrate the
product for use in their own experiment using appropriate negative and positive controls.

Product Specific Information

A suggested positive control for this product is Jurkat T cells.

Background/Target Information

The c-Jun amino-terminal kinases (JNKs)/stress-activated protein kinases (SAPKs) play a crucial role in stress responses in mammalian cells. The mechanism underlying this pathway in the hematopoietic system is unclear, but it is a key in understanding the molecular basis of blood cell differentiation. We have cloned a novel protein kinase, termed hematopoietic progenitor kinase 1 (HPK1), that is expressed predominantly in hematopoietic cells, including early progenitor cells. HPK1 is related distantly to the p21(Cdc42/Rac1)-activated kinase (PAK) and yeast STE20 implicated in the mitogen-activated protein kinase (MAPK) cascade. Expression of HPK1 activates JNK1 specifically, and it elevates strongly AP-1-mediated transcriptional activity in vivo. HPK1 binds and phosphorylates MEKK1 directly, whereas JNK1 activation by HPK1 is inhibited by a dominant-negative MEKK1 or MKK4/SEK mutant. Interestingly, unlike PAK65, HPK1 does not contain the small GTPase Rac1/Cdc42-binding domain and does not bind to either Rac1 or Cdc42, suggesting that HPK1. activation is Rac1/Cdc42-independent. These results indicate that HPK1 is a novel functional activator of the JNK/SAPK signaling pathway.

For Research Use Only. Not for use in diagnostic procedures. Not for resale without express authorization.